Malicious PDF — malware analysis report

Static analysis result for SHA-256 df21e1d520218615…

MALICIOUS

PDF

84.7 KB Created: 2021-06-29 06:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0ceaa4fdf1eaccd06d0b36b50a96d90f SHA-1: 92fb1475c701bae1a0f317f325ead938ab0fd788 SHA-256: df21e1d520218615e2ea2581d52c8f6687ccd37653f3d1d6f2b0e96618ad4d02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ketchas.ru/uplcv?utm_term=1600+lm+in+watts PDF link annotation
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/l7ulgggsqot4dq2pbm4kt0u7kl/20173486634.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608927dfb3be3---kezuvid.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083de441e7d4---tarigoraludenujoxeti.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d07f01b5e9e---lenusilutufozasim.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/62649747274.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/r6u1qum8hvi1jl41ic1bg7ng2u/16549568808.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/zadiwe.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/luvesanotevefe.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/21969976141.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/53349972913.pdfIn PDF document text
    • https://cooperspick.com/files/94686739166.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/uoictfcmnp35n2a363oo57uegu/faxeje.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/86345572227.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d79d870ac---vixegurudetewaj.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/66aa7c811617896d3f4b01ec748e1011/97663954672.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/3babea831c4f08c3c7bd817e7ccefcd4/47214769274.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/1db95aa5443605353dbd02ee125c74fc/puxazaxalivox.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/e539547986475949599350f02e3bbd0d/wovaxuse.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/636955a85836b493d29e4cc22601dcb0/mawito.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbda4267e5---2002913315.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/975cb00af2d36cde6ec966a09d5889c7/1981153181.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/cd1f1bb2bf2271a14e4a41ad5cc61772/gawojofalefijunam.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/a4eocoo410rhk6rgvj69p7ds1b/jibukokibegor.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE6 10248 bytes
SHA-256: 139ba70618fe24dd58a34d98ba6905538d8b704069e7631747725c02f91fd4d3
font_01_sfnt_off000102fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0C 16528 bytes
SHA-256: 02b0b9f1d8a2f182d363a7c0968faa7de058e31789ea3487994bb2b6f6331f19

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